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. 2018 May 3;18:7. doi: 10.1186/s12880-018-0251-y

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© The Author(s). 2018

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Joint sparsity property of multi-contrast image coefficients. Group sparsity for traditional wavelet transform is shown in (A), (a1-a4) are images of two contrasts (T1W and T2W MRI images) and their corresponding coefficients in the 3rd sub-bands of traditional redundant Haar wavelet transform. Group sparsity of GBRWT is shown in (B) and (b1-b2) are two selected fragments of GBRWT coefficients